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Physical and Dynamical Parameters of the Triple Stellar System: HIP 109951

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Abstract

The precise determination of the physical and dynamical parameters of the HIP 109951 triple star system (WDS J22161-0705AB) which is formed by the A, Ba, and Bb components are presented. The binary nature of component B was recently confirmed by studying the radial velocities. The analysis of the system follows Al-Wardat's complex method for analyzing CVBS which employs Kurucz (Atlas9) line blanketed plane-parallel atmospheres simultaneously with an analytic method for dynamical analysis (we used Docobo's method) to calculate the parameters of this triple system. The result of our study yielded the following parameters: TAeff = 5836 ± 80 K, RA = 1.090 ± 0.039R, log gA = 4.45 ± 0.06, MA = 1.05 ± 0.16M; TBaeff = 5115 ± 80 K, RBa = 0.596 ± 0.05R, log gBa = 4.60 ± 0.07, MBa = 0.83 ± 0.16M, TBbeff = 4500 ± 80 K, RBb = 0.490 ± 0.06R, log gBb = 4.65 ± 0.07, and MBb = 0.67 ± 0.16M based on the revised HIPPARCOS parallax. The orbital solution gave a total mass as M = 2.59M based on Gaia parallax and M = 2.15M based on the revised HIPPARCOS parallax. The synthetic spectral energy distributions (SED) and synthetic stellar photometry of the entire system and individual components are given and compared with the available observational ones. Finally, the positions of the system components on the HR diagram and the evolutionary tracks are given and their formation and the evolution of the system are discussed.

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Acknowledgments

This research has made use of SAO/NASA, the SIMBAD database, the Fourth Catalog of Interferometric Measurements of Binary Stars, IPAC data systems, Al-Wardat's code for analyzing close visual binary stars, the CHORIZOS code for photometric and spectrophotometric data analysis.

The authors thank Professor Mashhoor Al-Wardat for his valuable comments and suggestions.

Funding

This paper was supported by the Spanish “Minis-terio de Economia, Industria y Competitividad” under the Project AYA-2016-80938-P (AEI/FEDER, UE) and by the “Xunta de Galicia” under the Rede IEMath-Galicia, ED341DR 2016/022 grant.

Author information

Correspondence to S. G. Masda or J. A. Docobo.

Additional information

The text was submitted by the authors in English

Published in Russian in Astrofizicheskii Byulleten', 2019, Vol. 74, No. 4, pp. 481-491.

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Masda, S.G., Docobo, J.A., Hussein, A.M. et al. Physical and Dynamical Parameters of the Triple Stellar System: HIP 109951. Astrophys. Bull. 74, 464–474 (2019) doi:10.1134/S1990341319040126

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Keywords

  • binaries: close
  • binaries: visual
  • stars: fundamental parameters
  • stars: individual: HIP 109951